Slip distribution of the 2007 Bengkulu earthquake inferred from tsunami waveforms and InSAR data
Slip distribution of the 2007 Bengkulu earthquake inferred from tsunami waveforms and InSAR data
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根据海啸波形和 InSAR 数据推断 2007 年明古鲁地震的滑动分布
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
W. Pandoe
中科院分区：
文献类型：
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作者：
A. Gusman;Y. Tanioka;T. Kobayashi;H. Latief;W. Pandoe
[1]利用海啸波形和InSAR数据进行的联合反演研究为了解俯冲带地震的震级和空间范围提供了一种新的方法。2007年9月12日，印度尼西亚本库鲁西海岸发生8.5级大地震。印度洋周围的潮汐测量站和深海的两个海底压力传感器记录了这次事件引发的海啸。利用干涉合成孔径雷达(InSAR)观测了帕盖群岛和苏门答腊岛地震产生的地表位移。我们利用海啸波形和InSAR数据，通过结合空间平稳性约束的联合反演，估计了地震的滑动分布。由滑移分布计算的总释放地震矩为6.7×1021N m(MW 8.5)，与全球CMT解的地震矩6.71×1021 N m相一致。2007年地震的滑移量小于1797年和1833年地震后积累的潜在滑移量。前提是，在很长一段时间内，整个断层的滑动幅度必须相等。因此，在2007年大地震之后，可能会发生几次大地震，这些地震将打破板块界面，直到累积的潜在滑移完全释放出来。
[1] Joint inversion study using tsunami waveforms and InSAR data provides a new way to understand the magnitude and spatial extent of subduction zone earthquakes. A great earthquake (Mw 8.5) occurred on 12 September 2007 off the west coast of Bengkulu, Indonesia. The tsunami generated by the event was recorded by tide gauge stations around the Indian Ocean and by two bottom-pressure sensors in the deep sea. The ground surface displacements produced by the earthquake on Pagai Islands and on Sumatra Island were observed by Interferometric Synthetic Aperture Radar (InSAR). We estimated the slip distribution of the earthquake by joint inversion incorporating a spatial smoothness constraint, using tsunami waveforms and InSAR data. The total released seismic moment calculated from the slip distribution is 6.7 × 1021 N m (Mw 8.5), consistent with the seismic moment of the Global CMT solution, 6.71 × 1021 N m. The maximum observed tsunami heights along the coast of Bengkulu agree with those computed from the slip distribution. The slip amount of the 2007 earthquake is smaller than the amount of potential slip that has been accumulated since after the 1797 and 1833 events. The premise is that, averaged over long periods of time, the entire fault must slip equal amounts. Therefore the 2007 great earthquake could be followed by several great earthquakes that will rupture the plate interface until the potential slip that has been accumulated is completely released.